Steam-boiler superheater.



F. J. COLE.

- STEAM BOILBR SUPERHEATEP.. lAPPLIGA'IION FILED APR. 20, 1909.

Patented Oct. 12,1909.-

3 SHEETS-SEEET 1.

P. J. COLE. STEAM BOILER SUPERHEATEP..

APPLICATION FILED APR.20. 1909.

'Patnted 0Gt.12,1909.

3 SHEETS-SHEET 2.

i Q ll.

. P. J. com.

' STEAM BOILER SUPBRHEATER.

APPLIGATION FILED APE.20, 1909.

936,412, Patented-06u12, 1909.'

3 SHEETS-SHEET s.

WITNESSE FRANCIS II. COLE, OF SCHENECTADY, NEW YORK.

f STEAM-BOILER SUPERHEATER.

Specification of Letters Patent.

Application'led April 20, 1909. Serial No. 491,178.

To all whom it may concern:

' ie it known that I, FRANCIS J. Comi, of Schenectady, in the county of Schenectady and State of New York, have invented acertain new and useful improvement in" Steam- Boiler Superheaters, of which improvement the following is a specication.

The object of myinvention is to provide a superheating a} )pliance for steam boilers of the locomotive type, which shall oe readily applicable, well to existing boilers as to new constructions, and which shall be located entirely outside of the water and steam.

: )aces of the boiler, thereby reducing the changes in other parts involved in its application toa minimum; avoiding anyreduction.in heating surface, alteration of f iue sheets, or provision of larger diameter tubes; and increasing the capacity of the boiler by the provision of superheating surface additional to that obtainable in the ordinary tire Y tubes.

The improvement claimed is hereinafter fully set forth.

ln the great majority of locomotive boilersuperheaters which have heretofore been put in practice, the superheating appliances have been `either of the fire tube or of the smoke boX type, the superheating pipes being, in the former type, located in enlarged tubes in the upper and central portions of the tube space, taking the 'place of the ordinary boiler tubes and correspondingly decreasing the amount of evaporating surface. lii the latter type, the supcrheating pipes are located in the smoke box, but on account of the relatively low gas temperature therein, it is not practicable to obtain more than a drying effeet, or a very moderate superheat, unless the normal smoke box temperature is increased by the application of one or more tlues of greatly increased diameter to deliver the gases of combustionto the super-heating pipes at a much higher temperature than normal. Either of these types of superheaters, when a plied to an existing locomotive boiler, involves considerable alteration and change of parts, which my present invention is Idesired to avoid, as well as to avoid reduction of evaporatingsurface and provide superheating surface additionalto and inde,- pendent thereof. A

The leading and characteristic features of my present invention consist in a plurality of superheating pipes inclosed in casings located exterior to ,the boiler, and extending longitudinally along the sides thereof, to which casings portions of the gases of coinbustion are supplied through short tubes passing through the water spaces of the fire box. T he superheating pipes are disposed in pairs, connected, in U form, at their rear ends, and connected, at their forward ends, tothe saturated and the superheated steam compartments, respectively, of headers l0- eated in the smoke box. The traverse of the gases of combustion through the casings and around the -superheater pipes therein, is effected by positive draft, the intensity of which can be regulated as desired by varying the 'proportions of the nozzle or discharge openings, and which is induced by means of an annular exhaust pipe, in which the eX- l'iaust from the cylinders is either in the center, as in ordinary locomotive practice, withA plan view, partly in section. of the same,

with a supcrheater casing in horizontal longitudinal section Fig. 3, a vertical transverse section, on an enlarged scale, on the line a; a of Fig. 2 and the line a a of Fig'. et; Fig. 4, a vertical longitudinal section, on the same scale, through a steam header, on the line b b of Fig. 3; Fig. 5, a vertical transverse section, on the line c c of Fig. l;

Patented Oct. i2, 1909.l

and, Fig. 6, a front view, in elevation, with a header and adjoining junction box in sec-A tion.

My invention is herein exemplified as applied in connection with a locomotive boiler of one of thepresent standard types, comprising a iirebox, 5, at its rear end, having the usual front, .rear and side Water walls, a Waist or body, 4, connected to and extending forwardly from the tirebox, and a smoke box, eta, connected to the forward'end ofthe waist. A plurality of tire tubes, 4", extends 'through the Waist,rfrom a rear -iue sheet 1n the fireboX to afront flue sheet, 4d, inthe smoke box, in the ordinary manner. Steam .is l' supplied from the boiler. :to the 1cylinder-s,`

6l, rpassing throughthe-front liue sheet, 4d,

1 and,eonnetedy in vfrontthereof tov a' .tr-.ins- @verse T head, 62, froinwliich ,it-is :onduoted` through superheater pipes, 69,- Whioli, with 5` "their Connections 'and easings Will be pres-1 .i entlydeserbeiand, after being superheated'v .tinsaidpipegpasses tot-hecylinders through 1'0 branch steam pipes, 63, located, on opposite y vsides ofthe smoke boxff @In the practice of my. invention',f\support,

. youtsideof the boilershe1lI t side I.tliereoiand preferabl -jaeeifitto the.v horizontal c'entral'p'lane of the boiler, f superheater casing, 67,' .of sheet.-

...adjacent to each ywith its top ad- 'nietal, Wliielil is .most conveniently ,inadfe of 'rectangular transverse section, and' is'olothed arel provided :With' removable plates -orbon-y nets', 67 1,1 to permit-'access lto the :interior ot the eti-sings, land are holted-to flanges on the.' outer sidesiof steam' headers, 7th-secured to'- v the insdeoffthe'-slellof "the, smoke boX.

{box} .by a. lingftliroug firebox, the" rearend portions'. of the .superheater 4easingsfz'ue preferably lmade` in the formjoffseparate fjuntion boxes, 670., Jinto which. the tubes, yopen,- and which aire' prof,` v.vided .Wi-th' removable Aplates or bonnets-(G71, -to afford aceess to the latter. The fronteiids of the superheater oasings are-enneoted'to oha.m lo e'rs,'70 ontlie outer `sides of the liezul-A fers, and. saidfcharnbersjare onneted by. draft pipes, Gf'fwithanj'annular draft dis! charge Passage, 6 4?, which. surrounds the steam discharge opening or lnozzle, 649,l of

the exhaust-pipe, 64.' y runii1 ng gases of 'combustion are drawn from the'irebox, by the exhaust` blast from It .wai besan-aia@ when ultimamente' is thenozzle, at,'\tl`irough the short tubes,"5,

' and'the*superheater Cas.i`iigs67, and thence through th'e connected junction boxes, .67,

and out ofthe draft. discharge'passage` (342 `It ivill also be seen that the draft'through the passages, G4-b, induced by the-exhaust' blast, will be siibsta'nt'ia'lly greater than the draft iii'tlie smoke box vthrough the fire'.

tubes, 4"-, so that positive draft `will be' inainvtained through the superheitter .easiiigsa The junetion boxes, 67", are fitted to slide longitudinally on inclined faces, T0?, oii the I o1ite1,fianges ofthe headers to whirh are connected, so as, tojadniitot the io 4.tiid1r ial .,expansionaaid contraction otihe 'avenues or .channels,'throughout the length aolianiber--at one .end of the header, u'

superlieater hoasings. lThe weight ot the f junction boxes,-actiii g on the inclined hier", @maintains lthe jsurtaees iii.A Contact and iii- Each of the superheater easings, "o, serves l an inelosingreceptacle `for a l'iluifalitj,v ot

pairs ofsuperheate'r pipes, :69, whii-h are disposed -in V vertical rows, and vextend longi tudi-nal-ly-w`itl`iin it, .roinplanes a short di tanee 'from its 'rear 'end,'ii`itothe connected front junetion b0'X,-'and -also constitutes a A'conduit for tliegtraver'se otgases of combustion-from the rebogi, aroundsaid superlieater pipes, .to the'srnole"box,4 41a, a nd stack conneetd,` n. Ufforin, at their rearends, as by a return'bend'or elbow, G9'Fl,:ind are heli-l up vin normal :position inthe castings, 67, h v

supports of any 'suitable .andpi'eterreigl torni.

The forwardfe'nds of the sii'ierl'ieai'er i es Communicate, through thesaturiued and the4 `superheated steam .coinpa'rtn'iiei'ts ut the ,headers', 70, fas hereinafter .more .fu ily de.. seribed, Withvt-he'f'inain steam'supply pipe,i

6l, and thel delivery steam pipes, {33,r1'e4 spectivel-y, so as toronstitutecontinuous of which tHe steam p asses,"'and ivi-thin .which it is superheated, inits traverse troni this boiler to the cylinders.

The T liead,..62, ooi-respoi'ids`substantiallyy in .construction and relation to. the steani headers, 70, .With that set for-th in Letters Patent' lof the United States No. 875,895., grantedand issued to Aine under date of January '7,.1908,.and, .except as to being provided with the draft,-eliziviiibers, .Tt)-\'.y for the" ivi reception .of the gases. passing out ot the s iiperheater'.easings through -the junction boxes, '67, thesteain headers, 70, are not different, in Aany substantial pai'ftieulai, from those offsaidljetters. Patent. 'ihese inein-v "bersL, Which are not, 'in and of then'iseli'e o'laiined as ofniy present Ainvoiitioii, will be herein onlv brieliyv andl f'ioneralliVV ilesernveii. ,"1' Y. 'u v i b P'f.y 1 i Itaeh of the steani `li e a ilers, it), is iilii'iuwi. by horizontal'walls or partitions, into a' ralityof' saturatedsteanij chambers oi' .t partinonts, e, W- liieh'eoiinnunioate` through flanged-nozzle or supply passage, T tlf, there-A onfu'hieh'is eoiineoiedlo oneot a pair o `branchsaturated 'steam [npr-s, 4.52K, hun' i'roin vtheT head, GQ. and av pluraliy or' superheat'ed steani Chambers .oifetunpaiiw niente, TO?, Awhich'v eoini'nuini'ate, through a `rliainberat tlieopposi'te end ot the header,

with. a flanged nozzle ordeli'i'ei'y j iassago, 705,' thereon. iiliig'h is coniiei'teil to one ot lit) . compartment, 701', respectively, of said header.

The connection of the superheater pipes to the headers may be made in any suitable and preferred inanner, as, for example, by fitting collars on the ends of the pipes, which abut a `aiiist ball joints fitting in openings in .the adjacent walls of the steam headers, and

securing them in place by glands or followers, connected to,the headers by bolts` passing through the glands and headers, and made fast by nuts engaging screw threads oii the outer ends of the bolts, substantially as set forth in Letters Patent No. 875,895 aforesaid. The joints'between the superheater pipes and headers can be readily examined for the detection ofleaks,l by removing the bonnets, (37, of the junction boxes, and can be made tight by the adjustment, fioin the outside of the smoke box, ofthe nuts of the connecting bolts, which are convenient-ly accessible through the junction boxes.

lln operation, saturated steam from the boiler passes through the dry pipe, 61, T head. (12, and communicating branch steam supply pi pes, 62"", into each of the saturated steam compartments, e, of the steam headers. Tt), from which it passes, first rear- .i wai'dliv and then forwardly, through the pairs of `superheater pipes, GE), into the superheated steam,compartments, 7 Of, of the hea'ders. being, in its traverse through the superheater pipes, thoroughly superlieatcd'by the hot products of combustion which pass through the superheater easings, 67, inclosing the supciheater pipes. The supeiheated steam passes from the superheated steam conlpartineiits,-Ttlf, of the headers, into the t-.omi'uunieating'branch delivery steam pipes, (33, and through the latter to the engine cylinders. 12a, for utilization therein.

l claim as iny invention. and desire to se.- cure by Letters Patent:

1. ln a steam boiler superheater, the conibination of a superhcater casing extending longitudinally adjacent to a steam boiler' and eonununicating, at its opposite ends, with the lirebox and thesmoke box thereof, respectively, a steam header supported in the smoke box, and,,superhtaitcr pipes lo' cated in the superheatei' casing and connected at their forward ends to the steam header.

draft. through said casing. a steam header Q. In a steam boiler superheater, the coinhination of a superheater casing extending 'supported in the smoke box, and superheater superheater pipeslocated in the superheater casing and connected at their forward ends to the steam header. 4. In a steam boiler superheater, the com bination of a superheater casing extending longitudinally. adjacent to a steam boiler and communicating, at its forward end, with the smoke box, a junction box connected to a side lwater wall o f the firebox and communicating with the rear endof said casing, draft tubes passing through the lwater Wall and opening into the junction box, a steam header supported in the smoke box, and a plurality of pairs of superheater pipes extending, in U form, in the superheater easing and connected, at their forward ends, to the stea-ni'header. y 5. In a steam boiler snperheater, the combination of a superheater casing extending longitudinally adjacent to a steam boiler and communicating, at its rear end, with the Firebox, a. steam header supported in the smoke box and having a draft chamber 100 communicating with the forward end of the casing and with a draft discharge passage in the smoke box, and a plurality of pairs of supcrheater `pipes extending, in U form, in

'the superheater easing, and connected, at 105 4 their forward ends, to saturated and superlieated steam compartments in the steam header. l

G. In a steam boiler superheater, the combination of a superheater easing extending longitudinally adjacent to a steam boiler, and communicating, at its rear end, with thetrebox, a steam header supported in the soine box and having a draft chamber conm'ninicating with the forward end of 115 the easing, an annular exhaust pipe having separate steam and draft discharge passages, a pipe connecting the draft chamben of the header withthe draft discharge pas# sage of the exhaust pipe, and a plurality of pairs of superheater pipes extending, in U l forni, in the superheater easing, and conl'iiected, at their forward ends, to saturated Vand superlicated steam compartments in the steain header.

7. ln a steam boiler superheater, the comhination of a` supei'li'eater casing extending longitudinally adjacent to a steam boiler and communicating, at its "rear end, 'with the firebox, a steam header supported in the 13,0

.nesting the mward end of 'the CL." he draft dmmbexf, a. I mi opening in the jumziml box, :md a phuzfk 'ity @fp ai's of superheater pipes exffndinff smoke box and having a (5mm.- lumber ,Suid (im chamber 0 :l draft Lschzu' Y sage u1 'the snmke, box, a )11mm-mn, bm:

nU form, '111 the. Supa-hemel: aging am.

connected, at thai? forwai'd ends, to

Commm'cating at' its rem) @mi with the fire b0X,-a,n annuzni exhaust plpe havin# @www J. come.

mi H

u und the upL-l'heatefi tnosius:

'umms J lmms, 

